Lidl lights (based on Tuya TS0502A) - incorrect color temperature and minimal brightness

[all43]

Issue: Incorrect Color Temperature and Brightness Handling for Lidl TS0502A Lights

Setup Details

I've just set up Home Assistant with Zigbee2MQTT (version 2.1.1-dev, commit: 40f4147), installed as an HA add-on.

I have three types of Lidl white lights with adjustable color temperature:

• 14147206L
• HG06492B
• HG06492A

All of these are supported by Zigbee2MQTT as whitelabel variations of Tuya TS0502A.

---

Issue 1: Incorrect Color Temperature Mapping

When setting the color temperature via the Zigbee2MQTT web interface, I can't achieve the actual warmest temperature. Here’s what happens:

• NEUTRAL (default mid-point) appears to be the warmest I can get, but still far away from warm device capable of.
• COOLEST (130) is actually warmer than COOL (250).
• WARMEST (500) produces the same color as COOL (250) instead of getting warmer.
• Both COOL and WARMEST in Zigbee2MQTT match the coldest setting from the Lidl Home app.

Initially, I thought this was a range issue, but since COOLEST (130) is warmer than COOL (250), and WARMEST (500) is the same as COOL, it seems like an incorrect conversion.

---

Issue 2: Minimum Brightness handled incorrectly

• When setting brightness value less than 3, the device ignores brightness value, actual brightness remains at the same level as it was before
• If I set brightness to 0, the state changes to off, but the light remains on, brightness doesn't change as well.
• With brightness set to 3 device minimum brightness matches the one I could achieve with vendor app
• Regarding maximum brightness I'm not sure - I see no visual difference above 220 (for instance 255 looks the same for my eyes, but I don't have hardware to measure), however values aren't ignored so might be it is working as intended.

---

Request for Guidance

I don't have prior experience with zigbee-herdsman-converters or even with Home Assistant itself, so I’m unsure where to start.

• For the color temperature issue, could this be a matter of min/max mired values being inverted or incorrectly scaled?
• For the brightness issue, I don't know how to limit minimum value. I also not sure if the device should actually switch off when the value set to zero.

I’d love to help fix this, but I need guidance on which part of the codebase to look into. Any pointers would be greatly appreciated!

---

Additional Notes

I have access to the physical hardware and can test/debug any suggested changes.

[all43]

I've experimented with color temperature values. Seems that device scale is non standard and doesn't use mireds.
My results:

• 0 WARMEST
• 255 COOLEST
• 256 - WARMEST again, which probably means it is overflowing, resulting zero again. Also explains why 250 and 500 looks identical and why warmest values I could get were somewhere in the middle.

So now I want to figure out how to make herdsman to use 0-255 scale instead of mireds